I have no idea why Ruthie could possibly have a vision problem. Why would she go cross-eyed? Isnt sitting 6 inches from the TV perfectly normal?
She had never seen a TV down on her level and she was glued to it. She kept touching the screen the whole show. I have no idea how she could see anything that close, but then again, she does walk into objects quite a bit on a normal basis. It is hard to judge when that is your baseline.